74ddda71f4
The register_syscore_ops() function takes a mutex and might
sleep. In the IOMMU initialization code it is invoked during
irq-remapping setup already, where irqs are disabled.
This causes a schedule-while-atomic bug:
BUG: sleeping function called from invalid context at kernel/locking/mutex.c:747
in_atomic(): 0, irqs_disabled(): 1, pid: 1, name: swapper/0
no locks held by swapper/0/1.
irq event stamp: 304
hardirqs last enabled at (303): [<ffffffff818a87b6>] _raw_spin_unlock_irqrestore+0x36/0x60
hardirqs last disabled at (304): [<ffffffff8235d440>] enable_IR_x2apic+0x79/0x196
softirqs last enabled at (36): [<ffffffff818ae75f>] __do_softirq+0x35f/0x4ec
softirqs last disabled at (31): [<ffffffff810c1955>] irq_exit+0x105/0x120
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.13.0-rc2.1.el7a.test.x86_64.debug #1
Hardware name: PowerEdge C6145 /040N24, BIOS 3.5.0 10/28/2014
Call Trace:
dump_stack+0x85/0xca
___might_sleep+0x22a/0x260
__might_sleep+0x4a/0x80
__mutex_lock+0x58/0x960
? iommu_completion_wait.part.17+0xb5/0x160
? register_syscore_ops+0x1d/0x70
? iommu_flush_all_caches+0x120/0x150
mutex_lock_nested+0x1b/0x20
register_syscore_ops+0x1d/0x70
state_next+0x119/0x910
iommu_go_to_state+0x29/0x30
amd_iommu_enable+0x13/0x23
Fix it by moving the register_syscore_ops() call to the next
initialization step, which runs with irqs enabled.
Reported-by: Artem Savkov <asavkov@redhat.com>
Tested-by: Artem Savkov <asavkov@redhat.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Fixes:
|
||
|---|---|---|
| Documentation | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
README
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.